Etymology
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torpedo (n.)

1520s, "electric ray" (flat fish that produces an electric charge to stun prey or for defense), from Latin torpedo "electric ray," originally "numbness, sluggishness" (the fish so called from the effect of being jolted by the ray's electric discharges), from torpere "be numb" (from PIE root *ster- (1) "stiff"). The sense of "explosive device used to blow up enemy ships" is first recorded 1776, as a floating mine; the self-propelled version is from c. 1900. Related: Torpedic.

Torpedo. A fish which while alive, if touched even with a long stick, benumbs the hand that so touches it, but when dead is eaten safely. [Johnson]

torpedo (v.)

"destroy or sink (a ship) by a torpedo," 1874, from torpedo (n.). Also used late 19c. of blowing open oil wells. Figurative sense attested from 1895. Related: Torpedoed; torpedoing.

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Definitions of torpedo
1
torpedo (n.)
a professional killer who uses a gun;
Synonyms: gunman / gunslinger / hired gun / gun / gun for hire / triggerman / hit man / hitman / shooter
torpedo (n.)
a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States;
Synonyms: bomber / grinder / hero / hero sandwich / hoagie / hoagy / Cuban sandwich / Italian sandwich / poor boy / sub / submarine / submarine sandwich / wedge / zep
torpedo (n.)
an explosive device that is set off in an oil well (or a gas well) to start or to increase the flow of oil (or gas);
torpedo (n.)
a small firework that consists of a percussion cap and some gravel wrapped in paper; explodes when thrown forcefully against a hard surface;
torpedo (n.)
a small explosive device that is placed on a railroad track and fires when a train runs over it; the sound of the explosion warns the engineer of danger ahead;
torpedo (n.)
armament consisting of a long cylindrical self-propelled underwater projectile that detonates on contact with a target;
torpedo (n.)
any sluggish bottom-dwelling ray of the order Torpediniformes having a rounded body and electric organs on each side of the head capable of emitting strong electric discharges;
Synonyms: electric ray / crampfish / numbfish
2
torpedo (v.)
attack or hit with torpedoes;
From wordnet.princeton.edu